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Chapter 15 - Darwin's Theory of Evolution
Across
3. principle that each living species has descended, with changes, from other species over time; called descent with _?_
8. structures that have different mature forms in different organisms but develop from the same embryonic tissues
9. competition among members of a species for food, living space, and the other necessities of life
11. selection by humans for breeding of useful traits from the natural variation among different organisms
12. inherited characteristic that increases an organism's chance of survival
Down
1. change in a kind of organism over time; process by which modern organisms have descended from ancient organisms
2. process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest
4. ability of an organism to survive and reproduce in its environment
5. organ that serves no useful function in an organism
6. well-tested explanation that unifies a broad range of observations
7. principle that all living things were derived from common ancestors
10. preserved remains or evidence of an ancient organism